<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <title>计算圆的周长和面积</title>
</head>
<body>


    <form action="" style="background-color: lemonchiffon;width: 300px;">
        圆的半径：<input type="text" placeholder="半径" id="r"><br>
        圆的周长：<input type="text" placeholder="周长" id="b"><br>
        圆的面积：<input type="text" placeholder="面积" id="t">
    </form>




<script src="js/script.js"></script>
</body>
</html>